@page "/tasks"
@using Tasks.Module.Models
@using Tasks.Module.Services
@using Tasks.Module.Components.Dialogs
@inject ITodoService TodoService
@inject IDialogService Dialog
@inject IViewService ViewService

<div class="min-h-screen bg-gradient-to-br from-slate-50 to-slate-100">
    <div class="max-w-4xl mx-auto py-8 px-4">
        @* Header *@
        <div class="mb-8">
            <h1 class="text-3xl font-bold text-slate-800">My Tasks</h1>
            <p class="text-slate-500 mt-1">Manage your tasks and sub-tasks</p>
        </div>

        @* Search and Filters *@
        <div class="bg-white rounded-2xl shadow-md p-4 mb-4">
            <div class="flex flex-wrap items-center gap-3">
                <MudTextField T="string" 
                              @bind-Value:get="searchText"
                              @bind-Value:set="OnSearchChanged"
                              Placeholder="Search tasks..."
                              DisableUnderLine="true"
                              Adornment="Adornment.Start"
                              AdornmentIcon="@Icons.Material.Filled.Search"
                              Class="flex-grow"
                              Style="max-width: 400px;" />
                <MudButton Variant="Variant.Text" 
                          Color="Color.Default" 
                          StartIcon="@(_showFilters ? Icons.Material.Filled.ExpandLess : Icons.Material.Filled.ExpandMore)"
                          OnClick="ToggleFilters"
                          Class="rounded">
                    @(_showFilters ? "Hide Filters" : "Show Filters")
                </MudButton>
                <MudButton Variant="Variant.Outlined" 
                          Color="Color.Default" 
                          StartIcon="@Icons.Material.Filled.Add"
                          OnClick="CreateView"
                          Class="rounded">
                    Add View
                </MudButton>
            </div>
            @if (_showFilters)
            {
                <div class="flex flex-wrap items-center gap-3 mt-3">
                    <MudSelect T="int?" Label="Priority" Value="selectedPriority" ValueChanged="OnPriorityChanged" Clearable="true" Class="min-w-[140px]">
                        <MudSelectItem T="int?" Value="null">All</MudSelectItem>
                        <MudSelectItem T="int?" Value="0">
                            <div class="flex items-center gap-2">
                                <span class="w-2 h-2 bg-green-500 rounded-full"></span> Low
                            </div>
                        </MudSelectItem>
                        <MudSelectItem T="int?" Value="1">
                            <div class="flex items-center gap-2">
                                <span class="w-2 h-2 bg-yellow-500 rounded-full"></span> Medium
                            </div>
                        </MudSelectItem>
                        <MudSelectItem T="int?" Value="2">
                            <div class="flex items-center gap-2">
                                <span class="w-2 h-2 bg-red-500 rounded-full"></span> High
                            </div>
                        </MudSelectItem>
                    </MudSelect>
                    <MudSelect T="bool?" Label="Status" Value="selectedCompleted" ValueChanged="OnCompletedChanged" Clearable="true" Class="min-w-[140px]">
                        <MudSelectItem T="bool?" Value="null">All</MudSelectItem>
                        <MudSelectItem T="bool?" Value="false">
                            <div class="flex items-center gap-2">
                                <MudIcon Icon="@Icons.Material.Filled.Pending" Size="Size.Small" Color="Color.Warning" />
                                Pending
                            </div>
                        </MudSelectItem>
                        <MudSelectItem T="bool?" Value="true">
                            <div class="flex items-center gap-2">
                                <MudIcon Icon="@Icons.Material.Filled.CheckCircle" Size="Size.Small" Color="Color.Success" />
                                Completed
                            </div>
                        </MudSelectItem>
                    </MudSelect>
                </div>
            }
        </div>

        @* Quick Add Input *@
        <div class="bg-white rounded-2xl shadow-lg p-4 mb-6">
            <div class="flex items-center gap-3">
                <div class="flex-shrink-0 w-10 h-10 bg-indigo-100 rounded-full flex items-center justify-center">
                    <MudIcon Icon="@Icons.Material.Filled.Add" Color="Color.Primary" Size="Size.Small" />
                </div>
                <MudTextField T="string" 
                              @bind-Value:get="quickAddTitle"
                              @bind-Value:set="(v) => { quickAddTitle = v; StateHasChanged(); }"
                              Placeholder="Add a task quickly... (press Enter)"
                              DisableUnderLine="true"
                              Class="flex-grow"
                              Adornment="Adornment.None" 
                              OnKeyDown="HandleQuickAdd" />
                <MudButton Variant="Variant.Filled" 
                          Color="Color.Primary" 
                          OnClick="QuickAddTask"
                          Class="rounded-xl">
                    Add
                </MudButton>
                <MudButton Variant="Variant.Outlined" 
                          Color="Color.Primary" 
                          StartIcon="@Icons.Material.Filled.Add"
                          OnClick="OpenCreateDialog"
                          Class="rounded-xl">
                    Add Task
                </MudButton>
            </div>
        </div>

        @* Stats *@
        @if (!isLoading && tasks.Any())
        {
            <div class="flex items-center gap-4 mb-4 text-sm">
                <span class="text-slate-500">
                    @tasks.Count task@(tasks.Count != 1 ? "s" : "")
                </span>
                @{
                    var completed = tasks.Count(t => t.IsCompleted);
                    var pending = tasks.Count - completed;
                }
                @if (pending > 0)
                {
                    <span class="px-2 py-1 bg-yellow-100 text-yellow-700 rounded-full text-xs">@pending pending</span>
                }
                @if (completed > 0)
                {
                    <span class="px-2 py-1 bg-green-100 text-green-700 rounded-full text-xs">@completed completed</span>
                }
            </div>
        }

        @* Tasks List *@
        @if (isLoading)
        {
            <div class="flex justify-center py-12">
                <MudProgressLinear Color="Color.Primary" Indeterminate="true" />
            </div>
        }
        else if (tasks.Count == 0)
        {
            <div class="bg-white rounded-2xl shadow-lg p-12 text-center border border-slate-100">
                <div class="w-20 h-20 bg-slate-100 rounded-full flex items-center justify-center mx-auto mb-4">
                    <MudIcon Icon="@Icons.Material.Filled.Assignment" Size="Size.Large" Color="Color.Default" />
                </div>
                <h3 class="text-lg font-semibold text-slate-700">No tasks yet</h3>
                <p class="text-slate-500 mt-2">Type a task above and press Enter to get started</p>
            </div>
        }
        else
        {
            <div class="space-y-3">
                @foreach (var task in tasks)
                {
                    <TaskCard Task="task" 
                              OnToggle="ToggleTask" 
                              OnDelete="DeleteTask" 
                              OnUpdate="OpenUpdateDialog"
                              OnAddChild="OpenAddChildDialog"
                              CollapsedTasks="collapsedTasks"
                              ToggleCollapse="ToggleCollapse" />
                }
            </div>
        }
    </div>
</div>

@code {
    private List<TodoItemDto> tasks = new();
    private List<TodoItemDto> allTasks = new();
    private bool isLoading = true;
    private int? selectedPriority;
    private bool? selectedCompleted;
    private CreateTodoItemDto editTask = new();
    private string currentTaskId = string.Empty;
    private string quickAddTitle = string.Empty;
    private HashSet<string> collapsedTasks = new();
    private string searchText = string.Empty;
    private bool _showFilters = false;

    private void ToggleFilters()
    {
        _showFilters = !_showFilters;
    }

    protected override async Task OnInitializedAsync()
    {
        await LoadTasks();
    }

    private async Task LoadTasks()
    {
        isLoading = true;
        try
        {
            var filter = new TodoFilterDto
            {
                Priority = selectedPriority,
                IsCompleted = selectedCompleted
            };
            allTasks = await TodoService.GetAllTodosAsync(filter);
            ApplyFilters();
        }
        finally
        {
            isLoading = false;
        }
    }

    private void ApplyFilters()
    {
        var filtered = allTasks.AsEnumerable();

        if (!string.IsNullOrWhiteSpace(searchText))
        {
            filtered = filtered.Where(t => 
                t.Title.Contains(searchText, StringComparison.OrdinalIgnoreCase) ||
                (t.Description?.Contains(searchText, StringComparison.OrdinalIgnoreCase) ?? false));
        }

        tasks = filtered.ToList();
    }

    private void OnSearchChanged(string value)
    {
        searchText = value;
        ApplyFilters();
    }

    private async Task HandleQuickAdd(KeyboardEventArgs e)
    {
        if (e.Key == "Enter" && !string.IsNullOrWhiteSpace(quickAddTitle))
        {
            await QuickAddTask();
        }
    }

    private async Task QuickAddTask()
    {
        if (string.IsNullOrWhiteSpace(quickAddTitle))
            return;

        var newTask = new CreateTodoItemDto
        {
            Title = quickAddTitle.Trim(),
            Priority = 0
        };

        await TodoService.CreateTodoAsync(newTask);
        quickAddTitle = string.Empty;
        await LoadTasks();
    }

    private void ToggleCollapse(string taskId)
    {
        if (collapsedTasks.Contains(taskId))
            collapsedTasks.Remove(taskId);
        else
            collapsedTasks.Add(taskId);
    }

    private async Task OnPriorityChanged(int? value)
    {
        selectedPriority = value;
        await LoadTasks();
    }

    private async Task OnCompletedChanged(bool? value)
    {
        selectedCompleted = value;
        await LoadTasks();
    }

    private async Task ToggleTask(string id)
    {
        await TodoService.ToggleCompleteAsync(id);
        await LoadTasks();
    }

    private async Task DeleteTask(string id)
    {
        await TodoService.DeleteTodoAsync(id);
        await LoadTasks();
    }

    private async Task OpenCreateDialog()
    {
        editTask = new CreateTodoItemDto();
        
        var parameters = new DialogParameters<CreateTaskDialog> 
        { 
            { x => x.Task, editTask },
            { x => x.IsUpdate, false }
        };
        
        var options = new DialogOptions { CloseOnEscapeKey = true, MaxWidth = MaxWidth.Small, FullWidth = true };
        var dialog = await Dialog.ShowAsync<CreateTaskDialog>("Create Task", parameters, options);
        var result = await dialog.Result;
        
        if (result is { Canceled: false })
        {
            await TodoService.CreateTodoAsync(editTask);
            await LoadTasks();
        }
    }

    private async Task OpenAddChildDialog(TodoItemDto parentTask)
    {
        editTask = new CreateTodoItemDto { ParentId = parentTask.Id };
        
        var parameters = new DialogParameters<CreateTaskDialog> 
        { 
            { x => x.Task, editTask },
            { x => x.IsUpdate, false },
            { x => x.IsChild, true },
            { x => x.ParentTitle, parentTask.Title }
        };
        
        var options = new DialogOptions { CloseOnEscapeKey = true, MaxWidth = MaxWidth.Small, FullWidth = true };
        var dialog = await Dialog.ShowAsync<CreateTaskDialog>("Add Sub-task", parameters, options);
        var result = await dialog.Result;
        
        if (result is { Canceled: false })
        {
            await TodoService.CreateTodoAsync(editTask);
            await LoadTasks();
        }
    }

    private async Task OpenUpdateDialog(TodoItemDto task)
    {
        currentTaskId = task.Id;
        editTask = new CreateTodoItemDto
        {
            Title = task.Title,
            Description = task.Description,
            Priority = task.Priority,
            DueDate = task.DueDate,
            ParentId = task.ParentId,
            CategoryId = task.CategoryId,
            TagIds = task.TagIds.ToList(),
            FileId = task.FileId
        };
        
        var parameters = new DialogParameters<CreateTaskDialog> 
        { 
            { x => x.Task, editTask },
            { x => x.IsUpdate, true }
        };
        
        var options = new DialogOptions { CloseOnEscapeKey = true, MaxWidth = MaxWidth.Small, FullWidth = true };
        var dialog = await Dialog.ShowAsync<CreateTaskDialog>("Update Task", parameters, options);
        var result = await dialog.Result;
        
        if (result is { Canceled: false })
        {
            await TodoService.UpdateTodoAsync(new UpdateTodoItemDto
            {
                Id = currentTaskId,
                Title = editTask.Title,
                Description = editTask.Description,
                Priority = editTask.Priority,
                DueDate = editTask.DueDate,
                IsCompleted = task.IsCompleted,
                ParentId = editTask.ParentId,
                CategoryId = editTask.CategoryId,
                TagIds = editTask.TagIds,
                FileId = editTask.FileId
            });
            await LoadTasks();
        }
    }

    private async Task CreateView()
    {
        var parameters = new DialogParameters<CreateViewDialog>();
        var options = new DialogOptions { CloseOnEscapeKey = true, MaxWidth = MaxWidth.Small, FullWidth = true };
        var dialog = await Dialog.ShowAsync<CreateViewDialog>("Create View", parameters, options);
        var result = await dialog.Result;

        if (result is { Canceled: false } && result.Data is CreateTaskViewDto createDto)
        {
            await ViewService.CreateViewAsync(createDto);
        }
    }
}